King County, WA

1,364 public highway bridges

King County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, King County, Washington contains 1,364 public highway bridges. Roughly 31% are rated “Good,” 33.4% “Fair,” and 3.3% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

1,364

Total Bridges

31%

Good

33.4%

Fair

3.3%

Poor Condition

Condition Distribution

Good

31% (423)

Fair

33.4% (456)

Poor

3.3% (45)

All Bridges (1,364)

Sort:

SR 99

Over: DEXTER WAY N

7.4 N JCT SR 509, King, WA

Built 1930 ADT: 2,167

102ND AVE

Over: STATE ROUTE 522

4.1 E KCT SR 104, King, WA

Built 1950 ADT: 26,944

I-90 E-S RAMP

Over: I-5/AIRPORT WAY RAMP

JCT I-90, King, WA

Built 1965 ADT: 5,379

Central Conn Trail

Over: Redmond Way

0.5 MI N OF SR-520, King, WA

Built 1972 ADT: 27,000

PEDESTRIANS

Over: STATE ROUTE 202

3.9 E JCT SR 203, King, WA

Built 1987 ADT: 9,502

S 212TH ST

Over: SR 167 & SPRINGBROOK CK

2.8 N JCT SR 516, King, WA

Built 1973 ADT: 109,316

PED WALKWAY UC

Over: WEST LAKE SAMMAMISH PKWY

0.5 MI N OF JCT I-90, King, WA

Built 1950 ADT: 8,777

WOODLAND PARK PED

Over: SR 99

9.3 N JCT SR 509, King, WA

Built 1933 ADT: 34,369

WOODLAND PARK PED

Over: SR 99

9.4 N JCT SR 509, King, WA

Built 1933 ADT: 34,369

WOODLAND PARK PED

Over: SR 99

9.5 N JCT SR 509, King, WA

Built 1933 ADT: 34,369

SR 99

Over: DUWAMISH RIVER

0.1 N JCT SR 509, King, WA

Built 1956 ADT: 22,940

SR 18

Over: NPRY & CITY STREETS

1.0 E JCT SR 167, King, WA

Built 1956 ADT: 17,392

SR 18

Over: W VALLEY HWY(OLD SR 181)

2.3 E JCT I-5, King, WA

Built 1957 ADT: 19,821

MILITARY RD

Over: SR 18

1.7 E JCT I-5, King, WA

Built 1958 ADT: 101,558

SR 99

Over: SPOKANE ST

2.1 N JCT SR 509, King, WA

Built 1959 ADT: 14,020

DES MOINES MEM DR

Over: SR 99

1.9 N JCT SR 599, King, WA

Built 1959 ADT: 24,828

SR 18

Over: SR 164

JCT SR 18, King, WA

Built 1959 ADT: 26,034

SR 18

Over: BNRR, AUBURN-BLK DIAMOND

2.3 E JCT SR 164, King, WA

Built 1959 ADT: 9,224

I-5

Over: SR 18

0.3 E JCT SR 161, King, WA

Built 1959 ADT: 66,885

I-5

Over: SR 18

0.3 E JCT SR 161, King, WA

Built 1959 ADT: 66,885

I-5

Over: LAKE WASH SHIP CANAL

2.6 N JCT I-90, King, WA

Built 1962 ADT: 37,212

S 375TH ST

Over: I-5

0.7 N PIERCE CO, King, WA

Built 1959 ADT: 189,657

SR 161

Over: I-5

1.7 N PIERCE CO, King, WA

Built 1959 ADT: 189,657

NE 45TH ST

Over: I-5

1.7 N JCT SR 520, King, WA

Built 1960 ADT: 162,385

NE 50TH ST

Over: I-5

1.7 N JCT SR 520, King, WA

Built 1962 ADT: 162,385

S 320TH ST

Over: I-5

1.8 N JCT SR 18, King, WA

Built 1960 ADT: 158,689

RAMP 45TH TO I-5 N

Over: RAMP NB I-5 TO 50TH

1.7 N JCT SR 520, King, WA

Built 1961 ADT: 8,135

I-5 S RAMP TO 45TH

Over: 50TH RAMP TO I-5 S

1.7 N JCT SR 520, King, WA

Built 1961 ADT: 6,953

I-5

Over: S 272ND ST

4.8 N JCT SR 18, King, WA

Built 1961 ADT: 24,332

I-5

Over: S 272ND ST

4.8 N JCT SR 18, King, WA

Built 1961 ADT: 24,332

ROANOKE ST

Over: I-5

0.1 N JCT SR 520, King, WA

Built 1962 ADT: 147,676

SR 520 W-S RAMP

Over: I-5

0.1 N JCT SR 520, King, WA

Built 1962 ADT: 73,838

SR 18

Over: HOLDER CR HOBART RD

4.6 E JCT SR 169, King, WA

Built 1961 ADT: 8,691

OLIVE WAY

Over: I-5

1.6 N JCT I-90, King, WA

Built 1962 ADT: 181,753

DENNY WAY

Over: I-5

1.6 N JCT I-90, King, WA

Built 1962 ADT: 181,753

YALE ST RAMP

Over: I-5 REV RAMP

1.8 N JCT I-90, King, WA

Built 1962 ADT: 2,424

UITILITY

Over: REV LANES RAMP

1.8 N JCT I-90, King, WA

Built 1963 ADT: 2,424

I-5

Over: DENNY WAY-LAKEVIEW V

1.8 N JCT I-90, King, WA

Built 1962 ADT: 29,296

LAKEVIEW BLVD

Over: I-5

2.2 N JCT I-90, King, WA

Built 1963 ADT: 180,023

EASTLAKE AVE

Over: I-5 RAMPS

2.4 N JCT I-90, King, WA

Built 1963 ADT: 17,125

I-5

Over: SR 516

0.2 E JCT SR 99, King, WA

Built 1962 ADT: 35,066

I-5

Over: SR 516

0.2 E JCT SR 99, King, WA

Built 1962 ADT: 35,066

DELMAR DRIVE

Over: SR 520

0.1 E JCT I-5, King, WA

Built 1963 ADT: 35,304

10TH AVE

Over: SR 520

0.1 E JCT I-5, King, WA

Built 1962 ADT: 35,304

PEDESTRIAN

Over: SR 99

2.2 N JCT SR 599, King, WA

Built 1962 ADT: 24,828

NE 70TH-NE 71ST ST

Over: I-5

2.2 N JCT SR 520, King, WA

Built 1962 ADT: 149,425

8TH AVE N TO I-5 N

Over: I-5 N RAMP TO SR 522 E

JCT I-5, King, WA

Built 1963 ADT: 13,723

I-5 EXP RAMP

Over: I-5 NB,I-5 EXPRESS,RAMP

2.2 N JCT SR 520, King, WA

Built 1962 ADT: 74,713

SR 522

Over: W-S RAMP I-5

2.2 N JCT SR 520, King, WA

Built 1962 ADT: 149,425

I-405

Over: SUNSET BLVD (OLD SR 900)

1.1 E JCT SR 515, King, WA

Built 1963 ADT: 15,456

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

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Compiled by PlainBridges, Independent data publisher

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.